Add flow to files

Summary:
These are the last two files that aren't flow typed.

I'll look into strict typing for this file & others in a bit.

Reviewed By: elboman

Differential Revision: D10236440

fbshipit-source-id: 9f546b2c62f969ab550f9d16c5e6e12fb2371479

src/component/selection/getSampleSelectionMocksForTesting.js

@@ -7,6 +7,7 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  *
  * @format
+ * @flow
  * @emails oncall+draft_js
  */
 
@@ -16,8 +17,9 @@ const CharacterMetadata = require('CharacterMetadata');
 const ContentBlock = require('ContentBlock');
 const ContentState = require('ContentState');
 const EditorState = require('EditorState');
-const Immutable = require('immutable');
 const {BOLD} = require('SampleDraftInlineStyle');
+
+const Immutable = require('immutable');
 const {EMPTY} = CharacterMetadata;
 
 const getSampleSelectionMocksForTesting = (): Object => {

src/component/selection/getSampleSelectionMocksForTestingNestedBlocks.js

@@ -7,6 +7,7 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  *
  * @format
+ * @flow
  * @emails oncall+draft_js
  */
 
@@ -15,6 +16,7 @@
 const ContentBlockNode = require('ContentBlockNode');
 const ContentState = require('ContentState');
 const EditorState = require('EditorState');
+
 const Immutable = require('immutable');
 
 const getSampleSelectionMocksForTestingNestedBlocks = (): Object => {